Try using a few different CDs. Try using cassette tapes. The protect mode is usually a recording feature that prevents the operator from recording over a CD that has data on it. Make sure you don't have the RECORD button pressed in!

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If this is the correct model number CD-C622 there doesn't appear to be an input. You would need an input to connect this to a television and get sound out of it. I am copying and pasting the specs "It's a stereo mini-system with 40 watts per channel, and it incorporates a
three-disc CD changer, a dual-well cassette deck, and an AM/FM tuner.
The CD-C622 is equipped with surround sound decoding and surround
speakers that add an extra ambiance to music. CD functions include
32-track programmability and repeat/random playback. The radio offers 40
station presets. The cassette deck has full-logic controls. There's a
front panel clock/timer and a multi-color fluorescent display. A
five-program equalizer gives you presets to suit different types of
music, and there's a bass boost function, too. This system also comes
with a Toslink digital audio output for recording CDs onto CD-R or
MiniDisc."

Unless the input was omitted from this listing of the specs there wouldn't be a way to connect this to a television. I recommend purchasing a sound bar.

If protect is coming up on the display, it means the system is detecting a short somewhere on one of the speakers and so is turning the amp off to avoid damage. Check all the connections at the back of the amp to ensure they are not shorting, and at the back of each speaker, if nothing is found there, check each wire for damage (like squashed or rodent damage).